1142643 has 4 divisors (see below), whose sum is σ = 1523528. Its totient is φ = 761760.

The previous prime is 1142633. The next prime is 1142651. The reversal of 1142643 is 3462411.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1142643 - 2⁹ = 1142131 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1142633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190438 + ... + 190443.

It is an arithmetic number, because the mean of its divisors is an integer number (380882).

2^1142643 is an apocalyptic number.

1142643 is a deficient number, since it is larger than the sum of its proper divisors (380885).

1142643 is an equidigital number, since it uses as much as digits as its factorization.

1142643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380884.

The product of its digits is 576, while the sum is 21.

The square root of 1142643 is about 1068.9448068072. The cubic root of 1142643 is about 104.5450611889.

The spelling of 1142643 in words is "one million, one hundred forty-two thousand, six hundred forty-three".